Rotary rotating piece and table and chair

The utility model discloses a rotary type rotating piece which comprises a first part located on the upper side, a second part located on the lower side and a rotating part rotationally arranged on the outer side of the first part in a sleeving mode. The first part comprises a first upper part and a first lower part, the aperture of the first lower part is smaller than that of the first upper part, and the first upper part and the first lower part are integrally formed; a through waist-shaped limiting hole is formed in the rotating piece; in the connected state, the first lower part is inserted into the second part, and the rotating part is arranged on the outer side of the first lower part in a sleeving mode and penetrates through the kidney-shaped hole through a limiting piece to be fixedly connected with the surface of the first lower part. The utility model further discloses a table and chair comprising the rotary type rotating piece. Through the arrangement of the rotary rotating piece, the problem of co